CN101737726B - Light guide unit and backlight module - Google Patents
Light guide unit and backlight module Download PDFInfo
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- CN101737726B CN101737726B CN200810176749A CN200810176749A CN101737726B CN 101737726 B CN101737726 B CN 101737726B CN 200810176749 A CN200810176749 A CN 200810176749A CN 200810176749 A CN200810176749 A CN 200810176749A CN 101737726 B CN101737726 B CN 101737726B
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Abstract
The invention discloses a light guide unit comprising a light guide plate and a plurality of cylindrical lenses. The light guide plate is provided with a first surface, a second surface relative to the first surface and a light incident surface for connecting the first surface and the second surface, wherein the light guide plate is provided with a plurality of disperse screen dots which are positioned on the second surface. The cylindrical lenses are configured on the first surface; each cylindrical lens extends along the first direction and is provided with a curved surface bent in the second direction. The cylindrical lenses are arrayed along the second direction. The pitch of adjacent disperse screen dots in the first direction is smaller than that in the second direction. The invention also discloses a backlight module using the light guide unit.
Description
Technical field
The present invention is about a kind of light source module and optical element thereof, and especially in regard to a kind of module backlight (backlight module) and light element (light guide unit) thereof.
Background technology
Fig. 1 is a kind of generalized section of existing module backlight.Please with reference to Fig. 1, existing module 100 backlight comprises a LGP 110, a cold cathode fluorescent lamp pipe (cold cathode fluorescent lamp, CCFL) 120, one reflector plate 130 and a diffusion sheet (diffusion plate) 140.The second surface 114 and one that LGP 110 has a first surface 112, a relative first surface 112 connects the incidence surface 116 of first surface 112 and second surface 114.It is other that cold cathode fluorescent lamp pipe 120 is disposed at incidence surface 116, and be suitable for sending a light beam 122 towards incidence surface 116.Segment beam 122a can get in the LGP 110 via incidence surface 116, and via the titanium dioxide on the second surface 114 (titaniumdioxide, TiO
2) site 114a the light diffusion and be passed to reflector plate 130.Reflector plate 130 can reflect segment beam 122a, and makes it in regular turn through second surface 114, first surface 112 and diffusion sheet 140.On the other hand, segment beam 122b can be passed to first surface 112 via the light diffusion of titanium dioxide site 114a after getting into LGP 110, and then segment beam 122b can pass through first surface 112 and diffusion sheet 140 in regular turn.Light beam 112 (comprising segment beam 112a and 112b) can form area source through behind the diffusion sheet 140.
When titanium dioxide site 114a is a mode with screen painting when being formed at second surface 114, the size of titanium dioxide site 114a and its spacing can can't be done very for a short time.Therefore, when the top of LGP 110 did not dispose diffusion sheet 140,114a formed discontinuous bright spot in titanium dioxide site can be picked out by naked eyes, and makes module 100 backlight can't form uniform surface light source.
In order to improve the problem that discontinuous bright spot is picked out by naked eyes, be to adopt diffusion sheet 140 that discontinuous bright spot obfuscation is reached the effect of covering in the prior art.Yet, use a slice diffusion sheet 140 can increase cost more, and can cause light loss.
Summary of the invention
The present invention provides a kind of light element, and it can reduce cost, and can light be derived equably.
The present invention provides a kind of module backlight, and it can reduce cost, and can form uniform surface light source.
One of the present invention embodiment proposes a kind of light element, and it comprises a LGP and several lens pillars (rod lens).LGP has the second surface of a first surface, a relative first surface and the incidence surface of a connection first surface and second surface, and wherein LGP has more several diffusion sites, and it is positioned at second surface.These lens pillars are disposed on the first surface, and each lens pillar extends along a first direction, and have a curved surface that is bent upwards in a second party.These lens pillars are arranged along second direction.Adjacent these diffusion sites in the pitch on the first direction (pitch) less than the pitch on second direction.
Another embodiment of the present invention proposes a kind of module backlight, and it comprises an above-mentioned light element and a light-emitting component.Light-emitting component is disposed at by the incidence surface.Light-emitting component is suitable for sending a light beam, and light beam can get in the LGP via incidence surface, and is passed to these lens pillars via first surface.
In the light element of embodiments of the invention; Since the diffusion site in the pitch on the first direction less than the pitch on second direction; And light element has the lens pillar that extends along first direction; Therefore lens pillar can dwindle width and the spacing of diffusion site on second direction, and makes naked eyes after seeing through lens pillar, can't pick out the diffusion site.Thus, the module backlight of embodiments of the invention just can form uniform surface light source.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, the special embodiment that lifts of hereinafter, and cooperate institute's accompanying drawing, specify as follows.
Description of drawings
Fig. 1 is a kind of generalized section of existing module backlight.
Fig. 2 A is the schematic perspective view of the module backlight of the first embodiment of the present invention.
Fig. 2 B is the generalized section of the module backlight of Fig. 2 A along the I-I line.
Fig. 2 C is that light element among Fig. 2 A is with its first surface perspective view forward.
Fig. 3 is the schematic perspective view of the module backlight of the second embodiment of the present invention.
Fig. 4 is that the light element of module backlight of the third embodiment of the present invention is with its first surface perspective view forward.
Fig. 5 is that the light element of module backlight of the fourth embodiment of the present invention is with its first surface perspective view forward.
Fig. 6 is the schematic perspective view of the module backlight of the fifth embodiment of the present invention.
Fig. 7 A is the schematic perspective view of the module backlight of the sixth embodiment of the present invention.
Fig. 7 B is that light element among Fig. 7 A is with its first surface perspective view forward.
The specific embodiment
The explanation of following each embodiment is with reference to accompanying drawing, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to accompanying drawing.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.
First embodiment
Fig. 2 A is the schematic perspective view of the module backlight of the first embodiment of the present invention, and Fig. 2 B is the generalized section of the module backlight of Fig. 2 A along the I-I line, and Fig. 2 C is that light element among Fig. 2 A is with its first surface perspective view forward.Please with reference to Fig. 2 A to Fig. 2 C, the module backlight 200 of present embodiment comprises a light element 300 and a light-emitting component 210.Light element 300 comprises a LGP 310 and several lens pillars 320.LGP 310 has a first surface 312, a second surface 314 and an incidence surface 316.First surface 312 is relative with second surface 314, and incidence surface 316 connects first surface 312 and second surface 314.These lens pillars 320 are disposed at first surface 312.Each lens pillar 320 extends along a first direction D1, and has a curved surface C crooked on a second direction D2.In the present embodiment, the curved surface C of these lens pillars 320 is all convex surface, and it for example is the convex surface of the face of cylinder, elliptic cylinder or other shapes.In addition, in the present embodiment, first direction D1 is in fact perpendicular to second direction D2.Moreover in the present embodiment, LGP 310 and these lens pillars 320 are formed in one, and first direction D1 is in fact perpendicular to incidence surface 316.
In addition, LGP has more several diffusion sites 318, and it is positioned at second surface 314.Adjacent these diffusion sites 318 at the pitch P1 on the first direction D1 less than the pitch P2 on second direction D2.In the present embodiment, these diffusion sites 318 for example are suitable for making the site that material constituted of light diffusion for titanium dioxide site or other.Yet in other embodiments, the diffusion site can also be concave point or salient point on the second surface 314.It is other that light-emitting component 210 is disposed at incidence surface 316.In the present embodiment, light-emitting component 210 for example is a cold cathode fluorescent lamp pipe.Yet, in other embodiments, light-emitting section or other suitable light-emitting components that light-emitting component 210 can also be made up of several light-emittingdiodes.Light-emitting component 210 is suitable for sending a light beam 212, and light beam 212 can get in the LGP 310 via incidence surface 316, and is passed to these lens pillars 320 via first surface 312.Particularly, the segment beam 212a in the light beam 212 in the entering LGP 310 can produce light scattering phenomenon because of the diffusion of diffusion site 318 after being passed to diffusion site 318.In the present embodiment; One side of second surface 314 is configurable to have a reflector element 220; In order to light beam 212 is reflexed to first surface 312, the segment beam 212a that for example will produce light scattering phenomenon reflexes to first surface 312, and wherein reflector element 220 for example is a reflector plate.On the other hand, another part light beam 212b in the light beam 212 can be scattered to first surface 312 by diffusion site 318 after being passed to diffusion site 318.
In the light element 300 of present embodiment; Because lens pillar 320 has curved surface C crooked on second direction D2; And greater than the pitch P1 on first direction D1, so lens pillar 320 can be contracted to the degree that naked eyes can't identification with the spacing of bright spot on second direction D2 that produced because of scattered beam 212 of diffusion site 318 at the pitch P2 on the second direction D2 in diffusion site 318.In addition, because pitch P1 is less than pitch P2, the spacing of bright spot on first direction D1 that diffusion site 318 is produced because of scattered beam 212 can't be by the identification of naked eyes institute.For example, the thickness T of LGP 310 drops on approximately in 0.5 millimeter to 5 millimeters scope, and the pitch A of lens pillar 320 drops on approximately in 24 microns to 50 microns scope, that is the radius of curvature of curved surface C drops on approximately in 12 microns to 25 microns scope.Estimate that according to easy lens imaging formula the imaging enlargement ratio of lens pillar 320 drops in from 0.0016 to 0.032 the scope approximately.In other words, after lens pillar 320 imagings through LGP 310 tops, the spacing of bright spot on second direction D2 that diffusion site 318 is produced approximately has only one of a thirtieth to six original percentage.
Thus; When on LGP 310, forming diffusion site 318; Just can use cost more cheap and formed diffusion site and the bigger screen painting method of spacing thereof, and the area source that module backlight 200 is produced does not also have the person of being used goes out discrete bright spot with perusal problem.In other words, the light element 300 of present embodiment can be equably derived light beam 212, and can have lower cost, so the module backlight 200 of present embodiment can form uniform surface light source, and can have lower cost.In addition; When LGP 310 top desires configuration prismatic lenses (not illustrating) so that area source when comparatively concentrating; Can do not picked out owing to the effect of diffusion site 318 process lens pillar 320 by naked eyes; Therefore can not place diffusion sheet between lens pillar 320 and the prismatic lens, so can further reduce the cost of module 200 backlight, and reduce light loss.
It should be noted that it is to form with the screen painting method that the present invention does not limit diffusion site 318.In other embodiments, diffusion site 318 can also form with micro image etching procedure or other etching modes.
In the present embodiment, these diffusion site 318 width W 2 on second direction D2 are along with increasing progressively away from incidence surface 316.On the other hand, in the present embodiment, these 1 of diffusion site 318 width W on first direction D1 can be kept identical.Thus, help LGP 310 that light beam 212 is passed to away from incidence surface 316 parts, so that module backlight 200 can provide comparatively uniform surface light source.
Second embodiment
Fig. 3 is the schematic perspective view of the module backlight of the second embodiment of the present invention.Please with reference to Fig. 3, (please with reference to Fig. 2 A) is similar for the module 200a backlight of present embodiment and above-mentioned module backlight 200, and both difference is described below.In the light element 300a of the module 200a backlight of present embodiment; The curved surface C1 of these lens pillars of part 320a is a convex surface; And the curved surface C1 ' of these lens pillars of part 320a ' is a concave surface, and these curved surfaces C1 and these curved surfaces C1 ' alternately arrange on second direction D2.In the present embodiment, these curved surfaces C1 and these curved surfaces C1 ' constitute an one dimension sine surface.Yet in other embodiments, curved surface C1 can also be the convex surface of the face of cylinder, elliptic cylinder or other shapes, and curved surface C1 ' can also be the concave surface of cylindrical concave, elliptical cylinder-shape concave surface or other shapes.Light element 300a and above-mentioned light element 300 (illustrating like Fig. 2 A) have confers similar advantages and effect, no longer repeat at this.
The 3rd embodiment
Fig. 4 is that the light element of module backlight of the third embodiment of the present invention is with its first surface perspective view forward.Please with reference to Fig. 4, the light element 300b of the module backlight of present embodiment and above-mentioned light element 300 (illustrating like Fig. 2 C) are similar, and both difference is described below.In the light element 300b of present embodiment, the number density of diffusion site 318 is along with increasing progressively away from incidence surface 316.Thus, light element 300b just can be with light from deriving away from incidence surface 316 parts, so that module backlight can provide uniform surface light source.In addition, in the present embodiment, these diffusion site 318 width W 1 ' on first direction D1 can be identical in fact, and these diffusion site 318 width W 2 ' on second direction D2 also can be identical in fact.
The 4th embodiment
Fig. 5 is that the light element of module backlight of the fourth embodiment of the present invention is with its first surface perspective view forward.Please with reference to Fig. 5, the light element 300c of the module backlight of present embodiment and above-mentioned light element 300 (illustrating like Fig. 2 C) are similar, and both difference is described below.In the light element 300c of present embodiment, several diffusion sites 318 constitute several strip patterns 319.Each strip pattern 319 extends toward the direction away from incidence surface 316; And these strip patterns 319 are along arranging with incidence surface 316 parallel directions; In addition; The width W 3 of each strip pattern 319 so helps LGP 310 that light is passed to away from incidence surface 316 parts, so that module backlight can provide uniform surface light source along with increasing progressively away from incidence surface 316.
The 5th embodiment
Fig. 6 is the schematic perspective view of the module backlight of the fifth embodiment of the present invention.Please with reference to Fig. 6, the module 200d backlight of present embodiment and above-mentioned module backlight 200 (illustrating like Fig. 2 A) are similar, and both difference is described below.In the module backlight 200 of present embodiment, these lens pillars 320 constitute a column type lens plate 330, and column type lens plate 330 is moulding separately with LGP 310.
The 6th embodiment
Fig. 7 A is the schematic perspective view of the module backlight of the sixth embodiment of the present invention, and Fig. 7 B is that light element among Fig. 7 A is with its first surface perspective view forward.Please with reference to Fig. 7 A and Fig. 7 B, the module 200e backlight of present embodiment and above-mentioned module 200d backlight are similar, and both difference is described below.In the module 200e backlight of present embodiment, first direction D1 ' (being the bearing of trend of each lens pillar 320) is parallel in fact with incidence surface 316, and second direction D2 ' (being the orientation of these lens pillars 320) is vertical in fact with incidence surface 316.In addition, the distribution of diffusion site 318 is also along with first direction D1 ' and second direction D2 ' change compared to the change of the 5th embodiment.Particularly, in the present embodiment, adjacent these diffusion sites 318 at the pitch P1 ' on the first direction D1 ' less than the pitch P2 ' on second direction D2 '.In addition, in the present embodiment, these diffusion site 318 width W 2 on second direction D2 ' " along with increasing progressively away from incidence surface 316.
It should be noted that in other embodiments first direction can also be the parallel in fact and vertical incidence surface of difference with second direction, and the number density of diffusion site is along with increasing progressively away from incidence surface.Perhaps, first direction and the parallel in fact and vertical incidence surface of second direction difference, and the diffusion site constitutes as several strip patterns of the 4th embodiment.
In sum; In the light element of embodiments of the invention; Because lens pillar has the curved surface that is bent upwards in second party; And greater than the pitch on first direction, so lens pillar can be contracted to the degree that naked eyes can't identification because of the spacing of bright spot on second direction that scattered beam produced with the diffusion site in the pitch on the second direction in the diffusion site.Thus, when on LGP, forming the diffusion site, just can the more cheap screen painting method of use cost, and the area source that module backlight produced does not also have the person of being used goes out discrete bright spot with perusal problem.In other words, the light element of embodiments of the invention can be equably derived light beam, and can have lower cost, so the module backlight of embodiments of the invention can form uniform surface light source, and can have lower cost.
In addition; When LGP top desire configuration prismatic lens so that area source when comparatively concentrating; Can do not picked out owing to the effect of the diffusion bright spot that the site produced process lens pillar by naked eyes; Therefore can not place diffusion sheet between lens pillar and the prismatic lens, so can further reduce the cost of module backlight.
Though the present invention is open as stated with embodiment; Yet it is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; Can do a little change and retouching, so protection scope of the present invention is as the criterion with claims.Arbitrary embodiment of the present invention in addition or claim must not reach the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document retrieval, are not to be used for limiting interest field of the present invention.
Main designation tabulation
100,200,200a, 200d, 200e: module backlight
110,310: LGP
112,312: first surface
114,314: second surface
114a: titanium dioxide site
116,316: incidence surface
120: the cold cathode fluorescent lamp pipe
122,212: light beam
122a, 122b, 212a, 212b: segment beam
130: reflector plate
140: diffusion sheet
210: light-emitting component
220: reflector element
300,300a, 300b, 300c: light element
318: the diffusion site
319: strip pattern
320,320a, 320a ': lens pillar
330: column type lens plate
A, P1, P1 ', P2, P2 ': pitch
C, C1, C1 ': curved surface
D1, D1 ': first direction
D2, D2 ': second direction
T: thickness
W1, W1 ', W2, W2 ', W2 ", W3: width
Claims (19)
1. light element comprises:
One LGP, the second surface and with a first surface, relative this first surface connects the incidence surface of this first surface and this second surface, and wherein this LGP has more several diffusion sites, is positioned at this second surface; And
Several lens pillars; Be disposed on this first surface; Each this lens pillar extends along a first direction; And have a curved surface that is bent upwards in a second party, those lens pillars are arranged along this second direction, those wherein adjacent diffusion sites in the pitch on this first direction less than the pitch on this second direction.
2. light element as claimed in claim 1, wherein this first direction is perpendicular to this second direction.
3. light element as claimed in claim 1, wherein this LGP and those lens pillars are formed in one, and this first direction is perpendicular to this incidence surface.
4. light element as claimed in claim 1, wherein those lens pillars constitute a column type lens plate, and this column type lens plate and this LGP are moulding separately.
5. light element as claimed in claim 1, wherein those diffusion site width on this second direction are along with increasing progressively away from this incidence surface.
6. light element as claimed in claim 1, wherein the number density of those diffusion sites is along with increasing progressively away from this incidence surface.
7. light element as claimed in claim 1; Wherein those diffusion sites constitute several strip patterns; Each this strip pattern extends toward the direction away from this incidence surface; Those strip patterns are arranged along the direction parallel with this incidence surface, and the width of each this strip pattern is along with increasing progressively away from this incidence surface.
8. light element as claimed in claim 1, wherein those curved surfaces of those lens pillars are all convex surface.
9. light element as claimed in claim 1, wherein those curved surfaces of those lens pillars of part respectively are a convex surface, and partly those curved surfaces of those lens pillars respectively are a concave surface, and those convex surfaces and those concave surfaces are alternately arranged on this second direction.
10. module backlight comprises:
One light element comprises:
One LGP, the second surface and with a first surface, relative this first surface connects the incidence surface of this first surface and this second surface, and wherein this LGP has more several diffusion sites, is positioned at this second surface; And
Several lens pillars; Be disposed on this first surface; Each this lens pillar extends along a first direction; And have a curved surface that is bent upwards in a second party, those lens pillars are arranged along this second direction, those wherein adjacent diffusion sites in the pitch on this first direction less than the pitch on this second direction; And
One light-emitting component is disposed at by this incidence surface, and wherein this light-emitting component is suitable for sending a light beam, and this light beam can get in this LGP via this incidence surface, and is passed to those lens pillars via this first surface.
11. module backlight as claimed in claim 10, wherein this first direction is perpendicular to this second direction.
12. module backlight as claimed in claim 10, wherein this LGP and those lens pillars are formed in one, and this first direction is perpendicular to this incidence surface.
13. module backlight as claimed in claim 10, wherein those lens pillars constitute a column type lens plate, and this column type lens plate and this LGP are moulding separately.
14. module backlight as claimed in claim 10, wherein those diffusion site width on this second direction are along with increasing progressively away from this incidence surface.
15. module backlight as claimed in claim 10, wherein the number density of those diffusion sites is along with increasing progressively away from this incidence surface.
16. module backlight as claimed in claim 10; Wherein those diffusion sites constitute several strip patterns; Each this strip pattern extends toward the direction away from this incidence surface; Those strip patterns are arranged along the direction parallel with this incidence surface, and the width of each this strip pattern is along with increasing progressively away from this incidence surface.
17. module backlight as claimed in claim 10, wherein those curved surfaces of those lens pillars are all convex surface.
18. module backlight as claimed in claim 10, wherein those curved surfaces of those lens pillars of part respectively are a convex surface, and partly those curved surfaces of those lens pillars respectively are a concave surface, and those convex surfaces and those concave surfaces are alternately arranged on this second direction.
19. module backlight as claimed in claim 10 more comprises a reflector element, is disposed at a side of this second surface, in order to this beam reflection to this first surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810176749A CN101737726B (en) | 2008-11-20 | 2008-11-20 | Light guide unit and backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810176749A CN101737726B (en) | 2008-11-20 | 2008-11-20 | Light guide unit and backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101737726A CN101737726A (en) | 2010-06-16 |
| CN101737726B true CN101737726B (en) | 2012-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810176749A Expired - Fee Related CN101737726B (en) | 2008-11-20 | 2008-11-20 | Light guide unit and backlight module |
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| CN (1) | CN101737726B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102478681A (en) * | 2010-11-30 | 2012-05-30 | 联建(中国)科技有限公司 | Light guide element and light source device |
| CN103185233B (en) * | 2011-12-30 | 2015-06-17 | 中强光电股份有限公司 | Backlight module |
| CN108627903A (en) * | 2017-03-17 | 2018-10-09 | 江苏日月照明电器有限公司 | A kind of light emission rate is high and smooth surface uniformly, the light guide plate of no visual spot |
| CN112965161B (en) * | 2021-02-04 | 2022-03-08 | 东莞市元立电子科技有限公司 | Light guide plate and dot arrangement method thereof |
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2008
- 2008-11-20 CN CN200810176749A patent/CN101737726B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN101737726A (en) | 2010-06-16 |
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Granted publication date: 20120919 Termination date: 20171120 |